58/100CR Score
Ranked #1 because of its Google rating and trade focus: 4.8★ from 99 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Best Septic Service Companies in Union, MO (2026)
12 septic service companies ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Union: Septic Services, Inc., CR Score 58/100; 4.8★ from 99 Google reviews.
- 2
Best for emergencies (open 24/7): Signature Plumbing & Drain Cleaning LLC, posts 24/7 hours; ranked #2 of 12.
- 5
Most-reviewed: Superior Service, 2,219 Google reviews at 5.0★, the most of 12 ranked; ranked #5.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
12 Union septic service companies are ranked here by CR Score, from ten published factors. 2 are open 24/7, 4 open Saturdays and 3 open Sundays, based on posted hours. The median Google rating is 4.8★ across 12 rated businesses.
Top 10 septic service companies in Union at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Septic Services, Inc. | 58 | 4.8★ (99) | Union | — | Overall |
| 2 | Signature Plumbing & Drain Cleaning LLC | 57 | 4.8★ (104) | Union | 24/7 | Emergencies |
| 3 | Shamrock Sewer & Drain | 57 | 4.8★ (304) | Pacific, 16 mi away | 24/7 | — |
| 4 | Oberkramer Septic Solutions, LLC | 55 | 5.0★ (105) | Wildwood, 23 mi away | — | — |
| 5 | Superior Service | 55 | 5.0★ (2,219) | Dardenne Prairie, 25 mi away | Sat · Sun · Evenings | Most reviews |
| 6 | Integrity Septic And Sewer | 55 | 5.0★ (14) | Pacific, 12 mi away | — | — |
| 7 | King Septic Service, Inc. | 52 | 4.8★ (61) | Wildwood, 19 mi away | — | — |
| 8 | B & G Sewer & Septic LLC | 52 | 4.5★ (13) | Washington, 10 mi away | — | — |
| 9 | Wallach Septic Service | 52 | 4.2★ (56) | Wildwood, 21 mi away | — | — |
| 10 | The Sewer Pros | 51 | 4.9★ (594) | Chesterfield, 25 mi away | — | — |
The 12 best septic service companies in Union, ranked
Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.
Based in Union
57/100CR ScoreRanked #2 because of its Google rating and review volume: 4.8★ from 104 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Pacific, 16 mi away
57/100CR ScoreRanked #3 because of its Google rating and review volume: 4.8★ from 304 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Wildwood, 23 mi away
55/100CR ScoreRanked #4 because of its Google rating and trade focus: 5.0★ from 105 Google reviews, listed on Google as “Septic system service”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
Based in Dardenne Prairie, 25 mi away
55/100CR ScoreRanked #5 because of its Google rating and review volume: 5.0★ from 2,219 Google reviews, the most in Union.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Pacific, 12 mi away
55/100CR ScoreRanked #6 because of its Google rating and trade focus: 5.0★ from 14 Google reviews, listed on Google as “Septic system service”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
Based in Wildwood, 19 mi away
52/100CR ScoreRanked #7 because of its Google rating and trade focus: 4.8★ from 61 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Washington, 10 mi away
52/100CR ScoreRanked #8 because of its Google rating and trade focus: 4.5★ from 13 Google reviews, listed on Google as “Septic system service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Wildwood, 21 mi away
52/100CR ScoreRanked #9 because of its Google rating and trade focus: 4.2★ from 56 Google reviews, listed on Google as “Septic system service”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
#10 The Sewer Pros
Based in Chesterfield, 25 mi away
51/100CR ScoreRanked #10 because of its Google rating and review volume: 4.9★ from 594 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Eureka, 21 mi away
49/100CR ScoreRanked #11 because of its Google rating and trade focus: 4.9★ from 79 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Saint Peters, 18 mi away
48/100CR ScoreRanked #12 because of its Google rating and review volume: 4.8★ from 59 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Also serving Union
2 more septic service companies within 25 mi that we can't rank yet: too few reviews, or a trade we couldn't confirm. Listed A to Z.
| Business | Distance |
|---|---|
| O'Fallon Sewer & Plumbing Repair Service | 24 mi |
| Septic Tank Parts.com | In Union |
How we ranked Union septic service companies
We scored 12 Union septic service companies on ten factors, weighted as shown. A business is ranked when its trade is confirmed and it has 3 or more Google reviews or a claimed profile. A business with no Google reviews scores zero on rating, review volume and recency. Other unknown factors are left out, not counted as zero. Scores last refreshed November 3, 2026.
Paid placement never changes a rank or score. Featured businesses are paid, labelled, limited to 3 and shown above the ranking, outside it.
| Factor | Weight | Computed from | In Union data |
|---|---|---|---|
| Reputation | 25% | Google star rating, adjusted for how many reviews back it | Measured |
| Credentials | 15% | Active state license, bond and workers’ comp on file | Not yet collected |
| Review volume | 10% | Number of Google reviews, compared with the most-reviewed business on the list | Measured |
| Recency | 5% | Share of reviews from the last 12 months | Not yet collected |
| Availability | 5% | Weekly open hours, Saturday, Sunday, 24/7 or same-day | Measured |
| Trade focus | 10% | How clearly the business does this trade (its Google category and name) | Measured |
| Proximity | 5% | Based in the city scores highest, less the farther away it is | Measured |
| Claimed profile | 10% | The business has claimed its ContractorsRanked profile (free or paid earn the same) | Measured |
| Partnered | 5% | The business links to ContractorsRanked from its own website with our badge, checked periodically | Measured |
| ContractorsRanked reviews | 10% | Verified customer reviews collected by ContractorsRanked: their rating and how many there are | Measured |
Septic service companies in Union: frequently asked questions
Who is the best septic service company in Union?
By CR Score, the highest-ranked septic service company in Union, MO is Septic Services, Inc. with a CR Score of 58/100. It has 4.8★ from 99 Google reviews. Signature Plumbing & Drain Cleaning LLC (#2) and Shamrock Sewer & Drain (#3) follow. We ranked 12 septic service companies on ten factors, last updated November 3, 2026.
How many septic service companies are there in Union?
ContractorsRanked ranks 12 septic service companies serving Union, MO. 2 of them are based in Union; the rest serve it from nearby towns. Another 2 within 25 mi are listed but not ranked yet. Counts are as of November 2026.
Which septic service companies in Union are open 24/7?
2 ranked septic service companies in Union post 24/7 hours. The highest-ranked are Signature Plumbing & Drain Cleaning LLC (#2) and Shamrock Sewer & Drain (#3). Hours come from each business's Google listing as of November 2026, so call to confirm.
Which septic service companies in Union work on weekends?
4 of 12 ranked septic service companies post Saturday hours and 3 post Sunday hours. The highest-ranked open Saturdays are Signature Plumbing & Drain Cleaning LLC (#2), Shamrock Sewer & Drain (#3) and Superior Service (#5). Posted hours are office hours; crews may book weekend jobs separately.
What Google rating do Union septic service companies have?
The median Google rating among 12 rated septic service companies in Union is 4.8★, with a median of 89 reviews. Superior Service has the most, 2,219 reviews, and ranks #5. We adjust ratings for review count, so a few five-star reviews cannot top the list.
How does ContractorsRanked rank septic service companies?
Each septic service company gets a 0–100 CR Score from ten published factors, led by reputation (25%), credentials (15%), review volume (10%) and trade focus (10%). A business with no Google reviews scores zero on rating, review volume and recency; other factors we cannot measure are left out. Only businesses with a confirmed trade and 3 or more reviews, or a claimed profile, are ranked.
Do septic service companies outside Union count in this ranking?
Yes, if they are within 25 mi of the Union city center, our service radius for septic service companies. Each listing shows where the business is based and how far away it is. Proximity is 5% of the CR Score, so a nearby business gets a small edge.
Can septic service companies pay to rank higher on ContractorsRanked?
No. The CR Score never reads payment status, and this ranking has 0 paid placements. Up to 3 Featured businesses may appear above the list, labelled Featured and showing their honest rank.
Update log for Union
- November 2026: CR Scores recalculated for 12 septic service companies serving Union.
More septic service companies and Union pages
Septic service companies near Union
- Septic service companies in Washington, MO18 ranked
- Septic service companies in Wildwood, MO58 ranked
- Septic service companies in Eureka, MO58 ranked
- Septic service companies in Wentzville, MO24 ranked
- Septic service companies in Dardenne Prairie, MO40 ranked
- Septic service companies in Lake Saint Louis, MO31 ranked
- Septic service companies in Ballwin, MO62 ranked
- Septic service companies in Chesterfield, MO63 ranked
- Septic service companies in Manchester, MO63 ranked
- Septic service companies in O'Fallon, MO38 ranked
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